[Q] USB audio out

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http://forum.xda-developers.com – I recently "upgraded" from the Motorola Atrix 4G to the LG Optimus G. Wanted to know if there is a way to have audio out from the micro-usb in a manner similar to the Motorola car dock where the usb charging also conveys audio to a 3.5 mm plug. Currently I am using a vanilla dock where I have to repeatedly plug in a 3.5 mm audio cable and usb. It would be great to have only one cable connected. Any ideas ??? (HowTos)